Rock drill



Sept. 7, 1943.

o. J. vsci-16mm ROCK 15111141,v Filed Aug.. 29j-'1941 `2 Sheets-Sheet 1 ...WR m. F R ou .m m C N A u 5.1 I.-

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Sept. 7, 14943. o. J. scHoRER ROCK DRILL Filed Aug. 29, 1941 2 Sheets-Sheet 2 Worthington) tivnpllarridm "\"the;l;present invention is to provide ineansfor controlling the Vdelivery of .i cleansing fluid to the point .of contact` of theidrill lSteel with? the rock;

. .,1h1s"inventmnfrelateg,to'rpercussivel ololsfarid` i ,a morefgparticularlyf'to rockfdrills 'Anllobject tofu 4,

such liquid serv-ingtheidual` .purpose f. cleansing vlthe .drillihole and rofi wetting the ffrockfl drillin'gs,`

`tor keepingdown dust and f1reven'tion` 'f' silicofsis." fik-More 'specificallyfjthe presenti"irivention` pro! vides means controllingthe delivery `ofthe wet-f` tingluiquidor wateftothejdriii hole, operated y the delivery tof `operating pressure iluid Vto `the l r drill, "so that` at all times :during c )peratioriv of the` i drillwetting `liquid, Will be delivered toythe` drill` `v hole. i `With these `and other objects in vie`w,.as.may

` 3% appear from the accompanying. specification, the f o l l inventionIconsistsof'various features of construcnoni-ana combination of parts, which win benrst described :in connectionwith the accompanyingdrawings, showing Va Vrock drilll ofa preferred ,i `form embodying the invention, and the features ,f `forming the invention will be specificallypointed o out inthe claim. f i' "Y FigureV 1 is an endview of mock drin equipped with the improved waterpor liquid vcontrol mechanisln.

L Figure` 2 isa longitudinal seotio `through the rock drill taken on the line 2-2 *of Figure `1. j Figure Sis across-section `View' through the `rook ariutaken on the une 3-3 of Figure 2.

liquid control valve in closed position. 1

`the line 4f4 of Figure 1, showingthe wetting` Figure 5 isa diagrammatic'view show inga` by thethrottle `of the rock drill, whichcontrols o ignor (not` showniof said anu sfeer 12a-permit delivery of i wateryJ or otherl suitable liquid intmthe ldrill hole.;;j`Agtube orneedle IIf'extends from the head` 85 Iofa the rock. drill longitudinally rtherethrough,,atntheV axis of thedrillyfor rdelivering l V,water or-,iother uid to the bore Ill` of the drill vsteel"3;g 1 m A water connection I I is connected-` to `the head 8 Vof;the-ro'clr drillland `deliverswatenfrom any suitablerY source i, (not shown): tothe` rock" drill. 1 This `.Watexor `other liquidfzpasses through the passagewaylZ i in the heady!!` andy into-the annue 1 lar passageway I4 formed in the head, from which Vit'passes through the bore or passageway ISUinto the c harnberJI.v The chamber I6 opens into the bore llofthesleeve I8,`andthepassageof liq- 4uid fromthe chamber I6 into the borel` I1 is ycontrolled bya valve I9, which seats against a valve fseat20formed in the end of the sleeve I8.

fWetting fluid from the bore I'Iis delivered through a passage 2| into anannular passage 22, from whence it flows, through the radial passageway 22a into the annular passageway22b. A pluralityof'radial passages 23 extend inwardly from the` annular passageway 22b to the inlet of the tube `I I, permitting the wetting fluid to flow into vand through said `tube to the bore of the drill steel.

Figurefl` is a detail cross-section viewtaken on;`

slight modificationA of theginvention and illustrateration of the drill.

:the improved rock drillstructure includes a pisfing astructure wherein the quantity of wetting h f yliquid or Water delivered to the drillf. hole is proportionate to the percentage of "full, capacity op- X,"Referring more particularly to" the drawings,

ton I, reciprocated by means of pressure fluid in `a cylinder 2 for actuatinga drillsteel 3. `The.

nism for controlling operation ofthe piston form` "no part of the present invention. j i A throttle valve 5, actuated'by means of a ing `pressure fluid to the distributor control `valve throttle handle 6, controls delivery of the,v actuat- 'Tof the rock drill structure. The drill steel 3A is i provided with a longitudinally extending bore I: lllrwhich opens out through the `cuttinghead detailsofthe cylinder, piston andk valve mecha- The valve I9 is held tension nut 26. `The stem 2'I of the valvey I9 has an Aoperating plunger 28 formed thereon which i projects out of the outer end of thesleeve I8 and engages the perimeterof arcam 29, which latter is connected to the throttle 5 and is operated i therewith by` means of the throttle handle 6.' The earn-29 has a plurality of notches 30, 3I and 32 cut in its perimeter which receive the tapered end 33 ofthe plunger 28fso as to 'prevent oscillation of H `the plunger 28 and arrest any movement of the l throttlehandle 6 or throttle 5 under the vibratory action created by operation of the drill steel. The notch 3!) is deeper thanV thenotches 3I and 32 andis positionediontheperirneter` of the cam so that it `will receivethetapered (end 33,of the plunger 28,l when the throttle handle 6-is in position to close the throttle and cutoff the supply of` `pressure actuating fluid to the rock drill; at which time the valve I9 will be seated, cuttngfoil" the iiow of water 0r other wetting fluid to and through thetube II.

The notch 3l is .positioned at "apoint inter- `mediate the stop position of the throttle," correspondngto the notch 3B, and the full operating on its seat 20 by a springV i 24, the tension of which may be set by means of a position of thel throttle,l as represented by the` notch 32, so that whenthe drill is operating at partial 'speed ory under light throttle,by reason of the fact that these notches 3l and 32 areless in depththan the notch 30; the valve I9 will be held open and'waterfwill be delivered to the drill steelV and oscillation ofthe valve l9 and throttle 5'will 'be prevented. Y l

' From theforegoing it will befseengthat when- Figurev 5 shows a slight of the notches 3 l and 32 formed in the perimeter l 'ofithcam 29v ary, so tha'tfthe'valve -I9"fwil1 be heldl off'fits seat `26". in varyingfdegreesproporfl tionate to the percentage ofifull capacity owof pressure Yactuating fluid Vde'livered'toy the'vrock drillf y k'Ihusthel quantity of water yor wetting 'uid delivered to the drill hole will be in direct propor-I tionto the percentage of full capacity operation 'of the-rockdrill. w if" .f Ails:- "ff It willfbe 'understood that the invention" is not .tobeiimited tothe specific;g construction o'r I arrangement of parts shown, but thatthey may for controlling the delivery of operating pressurev -What is claimed is:

In a cleansing fluid control forl rock drills y including a rock drill having a head and a drill 'steelbored to deliver liquid to the cutting head thereof, `a liquid tube for delivering cleansing .liquid to the bore of the drill steel, a throttle valve fluid to therock drill, said rock drillheadprovided with an" annular passage-way and with a passage for delivering cleansing liquid f to said annular passage-way, said rock drill head'provided with a @direttori fof-the invention which, however, operates on exactly the same principle as the structure shown in Figures l f to 4', differing therefrom only inthat the 'depths l second annular passage-way and passageways establishing communication between said second annular passage-wayandthe inlet end'of said communicating passage-way, a spring for normally` seating said Valve, afcam'actuated 'by movement-Qfsaicl throttle .valve',v a stem'carried bysaid lquidrtcontrol valve and vengaging the .perimeter of the cam for'opening saidliquid controlv'alve againsttheftension .ofv the spring upon the opening of ;t;hethrottl-e,` said `cam'andl stern .provided with cooperating-means to-holdthe valve 'in".prr-:ideterl-iV v:ni-ned;adjusted positions` againstfoscillation Aby n vibrations -set up duringe-Qperation. of Athe `rock.

liguid"tube, saidrock drill provided with a comt 'municating passage-way establishing communication betweeny Vsaid annular passage-ways, y a' valve controlling .the flow of liquid from said rst f to saidrsecondannular passage-way through said 

